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New 6mm Advanced Rifle Cartridge

#3,552
She's a shooter. Sub-MOA with factory loads; took it out to 1,025 yards today. The 6 ARC is growing on me ... a lot.

IMG_1380.jpeg
 
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#3,555
Finally got the X-Caliber 13", mlgs lightweight barrel that I ordered back in March in. Going to try a BFK Mod 0 thermal fit upper and reuse a 12.7" Aero handguard I have on this one. Waiting for Rexus Ultra bolts to come back in stock in the next few weeks and should be in business.

PXL_20250715_035646026.jpg
 
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#3,556
BurtG said:
get a fix.

Handiest bolt gun around
Click to expand...

Indeed - MiniFix in 6ARC with a Proof Carbon barrel is the handiest bolt gun in my collection. I can strip it down to just the 3-20x and lug it up and down the mountains like it's no big deal at all.

Or I can load it up with some craziness...
1753122873686.png
 
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#3,557
Oh and I'll add, I've now gone through a number of different barrel lengths in semi-autos - from 26" to 20" to 16" to 12". I really think with anything longer than 16" you rapidly hit a point of diminishing returns with this cartridge. Granted, I'm not using commercial ammo, so maybe that'll run better, but my own 103 ELD-X / 105 Hybrid / 109 LRHT loads don't see a significant boost in velocity past 16", at least not the 25fps / inch expectation you see with other rifle/cartridge combos. I just started shooting the 12" and it's crazy how a shorty can essentially perform like an old school full size Mk12.
 
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#3,558
Dogtown said:
Indeed - MiniFix in 6ARC with a Proof Carbon barrel is the handiest bolt gun in my collection. I can strip it down to just the 3-20x and lug it up and down the mountains like it's no big deal at all.

Or I can load it up with some craziness...
View attachment 8731851
Click to expand...
Damn, save some pussy for the rest of us!
 
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#3,559
Dogtown said:
Oh and I'll add, I've now gone through a number of different barrel lengths in semi-autos - from 26" to 20" to 16" to 12". I really think with anything longer than 16" you rapidly hit a point of diminishing returns with this cartridge. Granted, I'm not using commercial ammo, so maybe that'll run better, but my own 103 ELD-X / 105 Hybrid / 109 LRHT loads don't see a significant boost in velocity past 16", at least not the 25fps / inch expectation you see with other rifle/cartridge combos. I just started shooting the 12" and it's crazy how a shorty can essentially perform like an old school full size Mk12.
Click to expand...
And here I have a 22” ar barrel on the shelf for a gas gun comp build when the m lol Vltor vis gets released
 
#3,561
Dogtown said:
Oh and I'll add, I've now gone through a number of different barrel lengths in semi-autos - from 26" to 20" to 16" to 12". I really think with anything longer than 16" you rapidly hit a point of diminishing returns with this cartridge. Granted, I'm not using commercial ammo, so maybe that'll run better, but my own 103 ELD-X / 105 Hybrid / 109 LRHT loads don't see a significant boost in velocity past 16", at least not the 25fps / inch expectation you see with other rifle/cartridge combos. I just started shooting the 12" and it's crazy how a shorty can essentially perform like an old school full size Mk12.
Click to expand...

So what were the velocities with the same loads and different barrel lengths?
 
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#3,562
I have read that 18 was optimal but that’s been a couple years and maybe factory only ammo, although I’m not entirely sure why hand loading would make a shorter barrel have less delta than factory ammo 🤷‍♂️
 
#3,573
Tex68w said:
It has settled to a 2465 average with factory 108's.
Click to expand...
Wow. Yeah, pretty similar.
I shot some last fall just because I had a couple boxes laying around. Here’s what I got.
Hornady 108 ELDM Factory
2504, 2506, 2480, 2472, 2445
2505, 2492, 2488, 2480, 2463
2498, 2517, 2511, 2513, 2510
2479, 2511, 2487, 2508, 2494
SD 18.5 ES 72 2”
 
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#3,574
Tex68w said:
I love my 14.5", it didn't give up much over the 18" I ran prior. Now I need to decide on a proper 22ARC barrel for the next build.
Click to expand...
I think for 22 ARC 18" is it. 2850 with 88gr eld m is a commonplace with factory ammo. I guess you could do 16" and run 2700 or so. I'm sure if you're loading that's different but it just doesn't seem to hold velocity as well as the 6 ARC when chopping the barrel. I know I'll be going 16" for my 6 ARC
 
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#3,575
5RWill said:
I think for 22 ARC 18" is it. 2850 with 88gr eld m is a commonplace with factory ammo. I guess you could do 16" and run 2700 or so. I'm sure if you're loading that's different but it just doesn't seem to hold velocity as well as the 6 ARC when chopping the barrel. I know I'll be going 16" for my 6 ARC
Click to expand...

I'd like to keep it no longer than 16" for the 22ARC. I want that build strictly for varmints. Something I can throw the thermal on and have little to no drop out to 300. I haven't started exploring the best factory loads just yet. Sadly, some have said the initial Proof barrels had issues.
 
#3,576
Tex68w said:
I'd like to keep it no longer than 16" for the 22ARC. I want that build strictly for varmints. Something I can throw the thermal on and have little to no drop out to 300. I haven't started exploring the best factory loads just yet. Sadly, some have said the initial Proof barrels had issues.
Click to expand...
In that case 62gr eld vt should still be plenty fast in a 16” i did hear about the proofs but you can always go craddock RTR
 
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